gitlab-ci: Disable gost in gnutls build

Current gost support in gnutls depends on nettle internals.

.gitlab-ci.yml

@@ -93,7 +93,7 @@ build/gnutls:
     make -j4 && make install
   - git clone --depth 1 --branch master https://gitlab.com/gnutls/gnutls.git gnutls-git
   - cd gnutls-git && git submodule update --init && ./bootstrap &&
-    ./configure --disable-cxx --disable-guile --disable-doc && make -j$(nproc) &&
+    ./configure --disable-gost --disable-cxx --disable-guile --disable-doc && make -j$(nproc) &&
     make -j $(nproc) check
   tags:
   - shared